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Question 406 of 1,750

SDLC Automation →hardMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

An organization uses AWS CodeBuild to compile a Java application. The buildspec.yml includes a pre_build phase that runs unit tests. Recently, the build started failing with 'NoClassDefFoundError' for certain test dependencies, even though the pom.xml includes them. The build environment uses an Amazon Linux 2 Docker image. What is the MOST likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The CodeBuild project has a cache that is corrupted or out of sync. Clear the build cache.
Cached dependencies may be stale or incomplete, leading to NoClassDefFoundError.
B
The S3 bucket for artifacts has incorrect permissions. Update the bucket policy.
Why wrong: Artifact permissions do not affect dependency classes at build time.
C
The CodeCommit repository is not pulling the latest code. Add a webhook to trigger builds on push.
Why wrong: The issue is with dependency resolution, not source code updates.
D
The build environment does not have Maven installed. Install Maven in the buildspec.
Why wrong: Amazon Linux 2 standard image includes Maven; missing Maven would cause different errors.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The CodeBuild project has a cache that is corrupted or out of sync. Clear the build cache.

The 'NoClassDefFoundError' for test dependencies that are declared in pom.xml indicates that the required JAR files are missing from the build environment at runtime. A corrupted or out-of-sync build cache in CodeBuild can cause previously downloaded Maven dependencies to be reused incorrectly, leading to missing classes even though the pom.xml specifies them. Clearing the cache forces a fresh download of all dependencies, resolving the mismatch.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The CodeBuild project has a cache that is corrupted or out of sync. Clear the build cache.
Why this is correct
Cached dependencies may be stale or incomplete, leading to NoClassDefFoundError.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The S3 bucket for artifacts has incorrect permissions. Update the bucket policy.
Why it's wrong here
Artifact permissions do not affect dependency classes at build time.
✗
The CodeCommit repository is not pulling the latest code. Add a webhook to trigger builds on push.
Why it's wrong here
The issue is with dependency resolution, not source code updates.
✗
The build environment does not have Maven installed. Install Maven in the buildspec.
Why it's wrong here
Amazon Linux 2 standard image includes Maven; missing Maven would cause different errors.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may assume the issue is a missing tool (Maven) or a code-pull problem, but the error specifically points to a dependency resolution failure, which is a classic symptom of a corrupted build cache in CI/CD pipelines.

Detailed technical explanation

How to think about this question

CodeBuild uses a local cache directory (e.g., /root/.m2 for Maven) to speed up builds by reusing downloaded dependencies. If the cache becomes stale or corrupted—for example, due to a partial download or a version mismatch from a previous build—the build may reference outdated JARs that lack certain classes. Clearing the cache (via the AWS console, CLI, or buildspec 'cache' section) forces Maven to re-resolve all dependencies from the remote repository, ensuring consistency.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

Visual reference

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The CodeBuild project has a cache that is corrupted or out of sync. Clear the build cache. — The 'NoClassDefFoundError' for test dependencies that are declared in pom.xml indicates that the required JAR files are missing from the build environment at runtime. A corrupted or out-of-sync build cache in CodeBuild can cause previously downloaded Maven dependencies to be reused incorrectly, leading to missing classes even though the pom.xml specifies them. Clearing the cache forces a fresh download of all dependencies, resolving the mismatch.

What should I do if I get this DOP-C02 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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